The UNSC used to get its ass kicked by the overwhelming force of the covenant. Now look at them. They wipe the floor. They are fighting The Covenant, The Promethians, The Insurrectionists, and minor Flood outbreaks and have been for about 8 years since their peak. Then let's take this into consideration. Look what 3 Destiny Guardians did to those factions. You think the Spartans couldn't do it any better? They would. The factions that the UNSC fights makes the other destiny factions look like wussies. Covenant who destroyed worlds and brought races to extinction? The overwhelming unstoppable power of the Flood? The ancient Promethians who are decendents of the all immortal Forerunners? The guerilla tactics of the Insurrectionists? Cmon don't deny the facts.